The winds of young Solar-type stars in Coma Berenices and Hercules-Lyra

Evensberget, D. and Carter, B. D. ORCID: and Marsden, S. C. ORCID: and Brookshaw, L. and Folsom, C. P. and Salmeron, R. (2022) The winds of young Solar-type stars in Coma Berenices and Hercules-Lyra. Monthly Notices of the Royal Astronomical Society, 510 (4). pp. 5226-5245. ISSN 0035-8711

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We present wind models of 10 young Solar-type stars in the Hercules-Lyra association and the Coma Berenices cluster aged around ∼0.26 and ∼0.58 Gyr, respectively. Combined with five previously modelled stars in the Hyades cluster, aged ∼0.63 Gyr, we obtain a large atlas of 15 observationally based wind models. We find varied geometries, multi-armed structures in the equatorial plane, and a greater spread in quantities such as the angular momentum loss. In our models, we infer variation of a factor of ∼6 in wind angular momentum loss J˙ and a factor of ∼2 in wind mass-loss M˙ based on magnetic field geometry differences when adjusting for the unsigned surface magnetic flux. We observe a large variation factor of ∼4 in wind pressure for an Earth-like planet; we attribute this to variations in the ‘magnetic inclination’ of the magnetic dipole axis with respect to the stellar axis of rotation. Within our models, we observe a tight correlation between unsigned open magnetic flux and angular momentum loss. To account for possible underreporting of the observed magnetic field strength we investigate a second series of wind models where the magnetic field has been scaled by a factor of 5. This gives M˙∝B0.4 and J˙∝B1.0 as a result of pure magnetic scaling.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current – Faculty of Health, Engineering and Sciences - School of Mathematics, Physics and Computing (1 Jan 2022 -)
Date Deposited: 14 Apr 2022 03:48
Last Modified: 27 Sep 2022 03:28
Uncontrolled Keywords: stars: magnetic field; stars: rotation; stars: solar-type; stars: winds; Sun: evolution; Sun: heliosphere
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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